(2)
AMM 51-31-01/201, Seals and Sealing
C. Access
(1) Location Zones
221/222 Control Cabin
D. Procedure
S 864-258
(1)
Make sure the two F/D switches on the MCP are in the OFF position.
S 864-157
(2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P7 Overhead Circuit Breaker Panel
1) 7A10, ADC L PWR
2) 7A12, AOA L
3) 7A13, AOA ALTN L
4) 7A14, ADC R PWR
5) 7A16, AOA R
6) 7A17, AOA ALTN R
7) 7J15, ADC C PWR
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34-12-02
ALL ú ú 05 Page 401 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
SEE A
GASKET
ASPIRATION TUBE
____NOTE: LEFT PROBE SHOWN
RIGHT PROBE SIMILAR FLEXIBLE
HOSE
A
Total Air Temperature Probe - Removal/Installation
Figure 401
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34-12-02
ALL ú ú 02 Page 402 ú Jun 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E17580
A
747-400
MAINTENANCE MANUAL
S 864-255
(3) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P6 Main Power Distribution Panel
1) 6D28, PROBE HEAT TAT L
2) 6D29, PROBE HEAT TAT R
S 864-003
WARNING:_______DO NOT PRESSURIZE THE PNEUMATIC SYSTEM. THIS CAN CAUSE INJURY TO PERSONS.
(4)
Do not apply the pneumatic power to the total air temperature probe.
S 864-133
(5)
Remove the sealant from around the bottom of the total air temperature probe (AMM 51-31-01/201).
S 024-005
(6)
Remove the total air temperature probe:
(a) Remove the screws from the bottom of the total air temperature probe.
CAUTION: DO NOT PULL THE PROBE AWAY FROM THE FUSELAGE WITH TOO MUCH
_______ FORCE. TOO MUCH FORCE ON THE PROBE CAN CAUSE DAMAGE TO THE PROBE ELECTRICAL CABLE.
(b)
Hold the probe and carefully apply force to loosen the gasket.
(c)
Carefully pull the probe from the fuselage to get access to the electrical connector and the pneumatic hose on the bottom of the probe.
(d)
Disconnect the electrical connector from the probe.
(e)
Temporarily attach the electrical connector to make sure the electrical connector does not fall into the fuselage.
(f)
Remove the pneumatic hose from the bottom of the probe.
(g)
Install a dust cap on the pnematic hose.
(h)
Install dust cap on the electrical connector.
(i)
Temporarily attach the hose to make sure the hose does not fall into the fuselage.
(j)
Remove the gasket and discard it.
TASK 34-12-02-404-137
3. Total Air Temperature Probe Installation (Fig. 401)
________________________________________
A. Standard Tools and Equipment
(1) Ohmmeter - measures 0.010 ohms with a precision of | 0.001 ohm.
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